Tube for nonrenewable fuses



Nov. 3, 1936. BLANCHET 2,059,507

TUBE FOR NONRENEWABLE FUSES Filed Dec. 25, 1952 A. ELB W I 2 Q? By flit omey Inventor Patented Nov. 3, 1936 UNITED STATES PATET QFFICE Adias E. Blanchet, M

ystic, Conn, assignor to Sonoco Products Company, Hartsville, S. 0., a

corporation of South Carolina Application December 23, 1932, Serial No. 648,664

1 Claim.

This invention relates to a tube formed of paper for use in the manufacture of non-renewable fuses and to the process of manufacturing the same, the general object of the invention being to provide a tube formed of sheets of paper formed into tubular form suitably held in said form with interior and exterior coatings of suitable material and having the properties of moisture resistance and of aiding the desired di-electric strength of the tube.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in V the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:-

Figure 1 is a view of the fuse constructed with the improved tube.

Fig. 2 is a view of the tube itself.

Fig. 3 is an end view of the tube.

Fig. 4 is a section on line 4-4 of Fig. 2.

Fig. 5 is a View showing how the tube is formed.

Fig. 6 is a View of a long tube.

As shown in Fig. 5, the tube I is formed of one or more sheets of paper 3 rolled into tubular form and held in this form by suitable adhesives or the like. The paper stock from which the sheets are formed should be of proper quality and possess correct dielectric strength. After the tube is formed, either in the finished length as shown in Fig. 2 or in the long length as shown at 2 in Fig. 6, the latter tube being out to the desired sizes to produce the short tubes, the tubes are inserted upright in wire trays and allowed to stand for approximately three days so that the tubes Will dry and will retain their rotundity.

After being thoroughly dried, they are unmersed in a bath of lacquer or other suitable product or impregnated with the same having the properties of moisture resistance and of aiding the desired di-electric strength of the tube, for a suflicient length of time to thoroughly coat the tube inside and out, as shown at t in Fig. 4.

After this coating process, the tubes are placed on individual wire strands, suspended from racks and allowed to dry out while being baked under proper temperature until the coating has completely set. The tubes are then ready for cutting into the necessary lengths providing they have not already been manufactured in the finished length desired, and this process is accomplished by placing each tube on a steel mandrel and arranging contact with steel knives correctly spaced as described in my application filed September 12, 1932, Serial No. 632,834.

Tubes manufactured in the above manner are used to replace the more expansive fibre tubes commonly used in the manufacture of non-renewable fuses.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claim.

Having thus described my invention, what I claim as new is:

A fuse tube formed of a strip of paper wound into tubular form and secured by adhesive material, said tube being coated inside and outside with moisture resistant dielectric material.

ADIAS E. BLANCHET. 

